My horse pulled a tendon,answer fast, please!?

We had a Speed show last night, and we were running speed and actions, right after the stop my horse wouldn't walk on her right hind leg, You can tell its her tendons that are swollen. Ive been putting Lineament on her leg and walking her around and soaking her foot too. I don't know if I should have her inside or not. Outside isn't muddy, but I'm not sure. I have a state qualifying show on Saturday and I'm hoping to get her as comfortable as possible. please help. Thanks